Improvement in dental plates



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HENRY TWITCHELL, OF PULSKZI, NEW YORK.

Leners raam No. 88,632, amd Apta 6, 1869.

IMPROVEMENT IN DENTAL PLATES.

4. The Schedule referred to in these Letters Patent and making peut af the same- Tc all whom it may concern Be yitknown that I, HENRY TWITGHELL, of Pulaski,

in the county of Oswego, and State of New York, have invented a new and useful lImprovement in Dental Plates; and I do hereby declare that the following is a full,.clear,l and exact description thereof, which will enabley others skilled in th^e art to make aud use the same, reference being had to the accompanying drawings, forming part of this specification. i

This inventionrelates to improvements in dental plates, whereby it is designed to provide plates that will have greater rmness or adhesion in the month, and which will be more soft and yielding in the contact with the surface of the mouth.v

It consistsin providing a soft rubber facing throughout all the portions of the plate which come into conv tact with the mouth.

Figure 1 represents 'a plan view of a dental plate, constructed according to my improvement; and Y AFigure 2 represents a transverse lsection of the same.

Similar letters of reference indicate like parts. I propose to construct dental plates with a hard base of rubber, or any other suitable material, in the ordinary manner, as represented at A, which I propose to cover, on the entire interior surface, with a thin sheet of Vsoft rubber,'B; to be secured in any preferred manner. It may also extend over the edge of the plate,

which comes in contact with the cheeks.

. me, this This arrangement prevents the irritation that arises from the hard rubber pressing upon the giisand cheeks. It also gives greater firmness and adhesion of theV plate to the gums, and to tlie roof of the mouth, preventing the ingress of food between the plate and the gums, and also preventing theedisplacement of the plate, by any Working of the latter upon the roof of the mouth,A and fills up any interstices, and prevents the admission of the air in case of any rocking or'slight displacement.

It may, in some instances, serve a good purpose to extend the said lining only in part over the entire snritce, but I prefer to arrange it over the whole.

.Having thus described my invention,V

I claim as new, and desire to secure' byl Letters Patentv Dental plates, whether constructed of hard rubb r, or other material, provided with softrubber lining, xtending wholly or partly over the entire interior surface of the same, substantially as audfor the purpose described.

The above specification of my invention, signed by day of 1868.

HENRY TlNHTGHELL.`

Witnesses:

FRANK BLocKLEY, ALEX. F. ROBERTS. 

